Porous bearing body



Patented July 29,

' the desired shape by 7 ing a solid lubricant to function as product.

UNITED STATES PATENT OFFICE Josnrn 33111011., or READING, rnmrsynvnnm Poisons BEARING BODY No Drawing.

This invention relates to bearings and bearing washers and their manufacture, particularly of the resinous type such as are made from a phenol-formaldehyde condensation There is at present on the market and sold under the trade name of bakelite oilless bearings, which are made by intimately mixing a powdered phenol-formaldehyde condensation product with a solid lubricant such. as graphite, talc or soapstone, then molded to means of heat and Pres sure. 7 I

On the whole it forms "a satisfactory bearing for certain usages, but its uses are limited to comparatively low speeds, when used as self lubricating bearings because of only havthe lubrieating medium.

It is the object of this invention to provide a bearingofthis type that will be porous and be capable of absorbing lubricating oils thruout its interior, and therefore extend its uses to higher speeds.

I do this by intimately mixing powdered phenol-formaldehyde condensatio "product with a powdered metal suchaszind then compressing the mixture in a mold off the desired shape by means of heat and pressure and subjectlng the result to an acid bat-h to remove or dissolve the powdered metal, after which the compressed body is removed from theacid bath to a hot water bath to dilute or washout the acid, and then immersing the compressed body in an alkaline bath to neutralize any possible traces of acid, then placing the compressed body in hot water again to thoroughly cleanse the pores. I

The compressed body is then placed in an oven whosetemperature is about 200 to volatilize the re ing moisture in the pores, after which thy horoughly cleansed body is impregnated/with a bearing oil by immersing the body a hot bath of lubricating oil.

The resultant product is a porous resinous body capable of absorbing a lubricating oil.

As one specific method ofcarrying outmy invention I proceed by intimatelymixing parts of a powdered phenol-formaldehyde condensation product with 30 parts of 'zinc Application filed April 11,

the powdered metal.

1928. Serial No. 269,310.

powder, or if a solid lubricant is to be added the mixture will comprise" 60 parts of a phenol-formaldehyde condensation product, 10 parts of either graphite, soapstone or talc,

. and 30 parts of zinc'powder.

The mixture is then placed in molds adapted for either cylindrical hearings or bearing Washers.

The bearing molds are fastened to the beds of standard hydraulic machines used for this type of work, and the molds are uniformly heated by steam. The desired mixture is then compressedto the desired shape by means of heat and pressure of about 2000 pounds per square inch.

The resultant product is a hard and solid body not capable of absorbing liquid.

The next step consists in immersing the compressed body in a suitable acid ca able of dissolving the metallic powder. .s is

Well known the powdered phenol-formalde-- hyde condensation product known on the mar-' ket under the trade name of bakelite; 1s

hydrochloric or sulphuric, the resinous part of the compressed body is unaifected by the acid, and the powdered metallic constituents are dissolved, thereby rendering the compressed body porous to the extent ofthe'proportion of the powdered metaljcontained therein.

If powdered graphite isused in the mix insoluble in most solvents, is infusible, not

ture, the same procedure can be followed be- I cause graphite is quite like resin in some properties, being unaffected by acids or alkalies,

and very stable under heat. 1

- The compressed bodies should be agitated while submerged in the acid to continually keep up the violent actionof the acid upon The compressed'bodies are ke t in the acid solution about two hours after w ich they are removed from the acid solution and dlpped and agitated in a bath of hotwater to wash outthe acid in the pores of the compressed 1 body, brought about by the diss llving of the powdered metal.

pressed bodies from the hot water bath to any alkaline bath such as a soda solution, so as to be sure and neutralize the last remaining traces of any acid.

The compressed bodies are then agitated in the alkaline solution for about one-half an hour, and then rinsed or dipped in hot water, to thoroughly cleanse the pores.

The pores in the compressed bodies upon removal from the hot water bath are filled with moisture, which is removed by placing the bodies in an oven containing a temperature of about 200 F.

The heat in the oven evaporates the moisture from the pores, and renders the bodies ready for impregnation with lubricationoils.

This is done by immersing the cleansed porous compressed bodies in a bath of hot lubricating oils, the temperature being about 180 F. i

While I have mentioned zinc powder in my preferred form of embodiment, it should be understood that other metallic powders will serve the purpose, also other resins may be used besides the phenol-formaldehyde condensation products.

I claim :w 7

1. The method of making a porous bearing body capableof absorbing liquid, which consists in intimately mixing a finely divided resinous product with a finely divided solid lubricant, and finely divided metal, then molding-the mixture to thedesired form by means of heat and pressure, and immersing the molded form in a bath of acid to dissolve the powdered metal.

2. The method of making a porous bearing body capable of absorbing liquid. which consists in intimately mixing finely divided resin, solid lubricant, and metal, then molding the mixture to the desired form with the aid of heat and pressure, and subjecting the molded form to a series of bathscomprising acid, and water to dissolve the powdered metal and wash out the acid in the compressed body.

' 3. The method of making a porous bearing body capable of absorbing liquid, which consists in intimately mixing finely divided resin, solid lubricant and metal. then molding the said mixture to 'the desired form by meansotheat and pressure, and subjecting the molded 'form to ;a'lseries of baths comprising acid, water, alka1iand then water, tip-dissolve. the pew erq flm l an neutra izie the chemicals'iri'thecompressed body.

' 4. The method of making'afporous bearing bodycapa lepf absorbingiquid. wh h nsists. in in imately m xinglfii elydi de resin, solid lnbrit ritnnd. me a t nm i the said ..mixtu e1t01 the". e r fo m by means of; heatand r' es n e',and. su je t n the molde termite series of. cal actions to render thebompres s'ed body porous, and

free from chemicals and placing the porous and cleansed body in a heated atmosphere to volatilize the moisture contained therein.

5. .The method of making a porous bearing body capable of absorbing liquid, which consists in intimately mixing finely divided resin, solid lubricant, and metal, then molding the said mixture to the desired form by means of heat and pressure, and subjecting the molded form to a series of chemical baths, to render the body porous and free from chemicals, placing the porous and cleansed body in a heated atmosphere to volatilize the moisture contained therein, and impregnating the cleansed porous body with a lubricating oil.

6. The method of making a porous bearing body capable of absorbing liquid which consists in'intimately mixing a powdered phenol-formaldehyde condensation product with powdered metal, then molding the mixture'to the desired form by means of heat and pressure, and then subjecting the said molded form to a series of chemical baths to render the said body porous and tree from chemicals and then impregnating the said body with a lubricating oil.

7. The method of making a porous bearing body capable of absorbing liquid which consists in mixing a resinous product with a finely divided metal, then molding the mixture to the desired form by means of heat and pressure, and then subjecting the said molded form to a series of chemicalbaths and heat, to render the said body porous and free from moisture, and then impregnating the said body with a lubricating oil.

8.v A bearing body comprising a porous structure of a compressed resinous product and capable of absorbing a liquid.

9. A bearing body comprising a porous structure of a resin and solid lubricant and capable of absorbing a lubricating od.

10. Abearing body comprising :1 porous structure of a phenol-formaldehydc condensation product and capable of absorbing a lubricating oil.

11. A bearing body comprising a porous structure of a powdered resin and powdered solid lubricant. and capable of absorbing a liquid.

12. A bearing body comprising a porous structure of a powdered phenol-formalde hyde condensation product and powdered graphite. and capableof absorbing a lubricating oil.

In testimony whereof I afiix my signature.

JOSEPH BRINCIL. 

